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Demonstrators hold up placards during a protest against potential British military involvement in Syria at a gathering outside the Houses of Parliament in central London on August 29, 2013. British Prime Minister David Cameron faced an uphill struggle on Thursday to secure parliament's approval for military intervention in Syria after the main opposition party said it would vote against the motion.

Demonstrators hold up placards during a protest against potential British military involvement in Syria at a gathering outside the Houses of Parliament in central London on August 29, 2013. British Prime Minister David Cameron faced an uphill struggle on Thursday to secure parliament's approval for military intervention in Syria after the main opposition party said it would vote against the motion. (ANDREW COWIE / AFP/Getty Images)

Demonstrators hold up placards during a protest against potential British military involvement in Syria at a gathering outside the Houses of Parliament in central London on August 29, 2013. British Prime Minister David Cameron faced an uphill struggle on Thursday to secure parliament's approval for military intervention in Syria after the main opposition party said it would vote against the motion.ANDREW COWIE / AFP/Getty Images